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Chemistry
Grade 10: Periodic Table
| Term | Definition |
|---|---|
| Groups | The vertical columns in the periodic table. |
| Periods | The horizontal rows in the periodic table. |
| Atomic radius | Radius of an atom, i.e. the mean distance from the nucleus to the border of the outer orbital. |
| Ionisation energy | Energy needed per mole to remove an electron(s) from an atom in the gaseous phase. |
| First ionisation energy | Energy needed per mole to remove the first electron from an atom in the gaseous phase. |
| Electron affinity | The energy released when an electron is attached to an atom or molecule to form a negative ion. |
| Electronegativity | A measure of the tendency of an atom in a molecule to attract bonding electrons. |